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Part G Water Calculation Formula:
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The Part G water calculation is a method specified by the UK Government for estimating water consumption in building regulations. It calculates total water usage based on fixture consumption values plus a standard additional allowance.
The calculator uses the Part G water formula:
Where:
Explanation: The equation sums all fixture consumption values and adds a standard 5 l/person/day allowance as specified in UK building regulations.
Details: Accurate water calculation is essential for compliance with UK building regulations, ensuring adequate water supply planning, and promoting water efficiency in building design.
Tips: Enter comma-separated fixture consumption values in l/person/day. Only positive numeric values will be considered in the calculation.
Q1: What is the purpose of the +5 value in the formula?
A: The +5 represents a standard additional water allowance required by UK building regulations Part G to account for miscellaneous water uses not covered by specific fixtures.
Q2: What are typical fixture consumption values?
A: Typical values vary by fixture type but generally range from 4-6 l/person/day for toilets, 6-8 l/person/day for showers, and 8-12 l/person/day for baths.
Q3: When is this calculation required?
A: This calculation is required for new building projects and major renovations in the UK to demonstrate compliance with Part G of the Building Regulations.
Q4: Are there limitations to this calculation method?
A: This method provides an estimate based on standard values. Actual water usage may vary based on user behavior, fixture efficiency, and other factors.
Q5: Where can I find official guidance on Part G calculations?
A: Official guidance is available in the UK Government's Approved Document G and supporting documentation from relevant regulatory bodies.